An unusual type of cilium

Area of Science:

• Cell Biology
• Dental Anatomy
• Microscopy

Background:

• Connective tissue cells in dental pulp are crucial for tooth development and maintenance.
• Cilia are microtubule-based cellular appendages involved in various functions, including motility and sensory perception.
• The presence and structure of cilia in dental pulp cells are not well-documented.

Purpose of the Study:

• To investigate the presence and ultrastructure of cilia in the connective tissue cells of unerupted dog teeth.
• To characterize the microtubule organization within these observed cilia.

Main Methods:

• Transmission electron microscopy (TEM) was utilized to examine the ultrastructure of dentinal pulp cells from unerupted dog teeth.
• Detailed analysis of cilia cross-sections was performed to identify microtubule arrangements.

Main Results:

• Occasional cilia were identified on connective tissue cells within the dentinal pulp of unerupted dog teeth.
• The internal structure of these cilia revealed a characteristic 9+1 microtubule arrangement (nine peripheral doublets and one central doublet).
• A deviation to nine peripheral doublets was observed near the basal body.

Conclusions:

• The findings demonstrate the presence of motile cilia in the dentinal pulp connective tissue cells of unerupted dog teeth.
• The observed 9+1 microtubule structure suggests a potential role for these cilia in sensory or signaling pathways within the dental pulp.
• Further research is warranted to elucidate the specific function of these cilia in the dental pulp environment.